N=int(input())
L=list(map(int,input().split()))
a=0
d=0
e=0
R=range(1,N+1)
for i in range(N):
    a+=(i+1)*L[i]
    e+=(i+1)**2
b=sum(L)
c=((1+N)*N)//2
d=N*a-b*c
f=N*e-c**2
A=d/f
n=e*b-a*c
B=n/f
print(A+B,A)
Q=0
for i in range(N):
    Q+=(L[i]-(A*(i+1)+B))**2
print(Q)